(Cannabidiol (CBD) and Cancer Therapy) "In conclusion, a cannabinoid-based therapeutic strategy for neural diseases devoid of undesired psychotropic side effects could find in CBD [a cannabinoid] a valuable compound in cancer therapies along with the perspective of evaluating a synergistic effect with other cannabinoid molecules and/or with other chemotherapeutic agents as well as with radiotherapy. Whatever the precise mechanism underlying the CBD effects, the present results suggest a possible application of CBD as a promising, nonpsychoactive, antineoplastic agent."

Source

Massi, Paola; Vaccani, Angelo; Ceruti, Stefania; Colombo, Arianna; Abbracchio, Maria P., and Parolaro, Daniela, "Antitumor Effects of Cannabidiol, a Nonpsychoactive Cannabinoid, on Human Glioma Cell Lines," The Journal of Pharmacology and Experimental Therapeutics (Bethesda, MD: The American Society for Pharmacology and Experimental Therapeutics, March 2004) Vol. 308, p. 845.
http://jpet.aspetjournals.org…